JP5694780B2 - バッテリー用のポリマー電解質 - Google Patents

バッテリー用のポリマー電解質 Download PDF

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JP5694780B2
JP5694780B2 JP2010543297A JP2010543297A JP5694780B2 JP 5694780 B2 JP5694780 B2 JP 5694780B2 JP 2010543297 A JP2010543297 A JP 2010543297A JP 2010543297 A JP2010543297 A JP 2010543297A JP 5694780 B2 JP5694780 B2 JP 5694780B2
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polymer
electrolyte
polymer block
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electrolyte material
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JP2011510456A5 (zh
JP2011510456A (ja
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ニタシュ ペルヴェス バルサラ
ニタシュ ペルヴェス バルサラ
ハニー バサム アイトゥント
ハニー バサム アイトゥント
イラム グル
イラム グル
モヒト シン
モヒト シン
ウィリアム ハドソン
ウィリアム ハドソン
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University of California
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University of California
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0085—Immobilising or gelification of electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Dispersion Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Conductive Materials (AREA)
  • Secondary Cells (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
JP2010543297A 2008-01-16 2009-01-16 バッテリー用のポリマー電解質 Active JP5694780B2 (ja)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US2161308P 2008-01-16 2008-01-16
US61/021,613 2008-01-16
PCT/US2009/031356 WO2009092058A1 (en) 2008-01-16 2009-01-16 Gel polymer electrolytes for batteries

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JP2011510456A JP2011510456A (ja) 2011-03-31
JP2011510456A5 JP2011510456A5 (zh) 2012-03-01
JP5694780B2 true JP5694780B2 (ja) 2015-04-01

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US (1) US8889301B2 (zh)
EP (1) EP2240975B1 (zh)
JP (1) JP5694780B2 (zh)
CN (1) CN101939869B (zh)
WO (1) WO2009092058A1 (zh)

Families Citing this family (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9893337B2 (en) 2008-02-13 2018-02-13 Seeo, Inc. Multi-phase electrolyte lithium batteries
US9054372B2 (en) * 2008-08-01 2015-06-09 Seeo, Inc. High capacity anodes
US9882241B2 (en) 2008-08-01 2018-01-30 Seeo, Inc. High capacity cathode
CA2752106A1 (en) * 2009-02-11 2010-08-19 Dow Global Technologies Llc Highly conductive polymer electrolytes and secondary batteries including the same
WO2011132717A1 (ja) * 2010-04-22 2011-10-27 日油株式会社 電気デバイス用非水電解液及びそれを用いた二次電池
KR101367217B1 (ko) * 2011-03-28 2014-03-12 포항공과대학교 산학협력단 고분자로 치환된 실리콘 나노 입자와 자기 조립성 블록 공중합체를 포함하는 고성능 리튬-폴리머 전지
CN102212239B (zh) * 2011-04-29 2013-03-27 嘉兴恒威电池有限公司 用于碱性电池的胶凝剂、胶质阳极混合物及碱性电池
CN102324303B (zh) * 2011-06-20 2012-11-21 华东师范大学 一种杂化聚合物凝胶电解质及其制备方法
WO2013033126A1 (en) 2011-09-02 2013-03-07 Seeo, Inc. Microsphere composite electrolyte
KR101356393B1 (ko) 2012-02-14 2014-02-03 한밭대학교 산학협력단 리튬-황 전지용 양극 및 이를 포함하는 리튬-황 전지
CN103840206A (zh) * 2012-11-27 2014-06-04 海洋王照明科技股份有限公司 凝胶聚合物电解质及其制备方法
US9923234B2 (en) 2013-04-29 2018-03-20 Seeo, Inc. Long cycle life lithium sulfur electrochemical cells
KR102163733B1 (ko) 2013-11-29 2020-10-12 삼성전자주식회사 리튬 전지용 고분자 전해질 및 이를 포함하는 리튬 전지
CN106165179A (zh) * 2014-03-21 2016-11-23 巴斯夫欧洲公司 固体电解质
US10044064B2 (en) 2014-04-18 2018-08-07 Seeo, Inc. Long cycle-life lithium sulfur solid state electrochemical cell
KR101933025B1 (ko) * 2014-04-18 2018-12-27 시오 인코퍼레이티드 사이클 수명이 긴 리튬 황 고상 전기화학 셀
US9774058B2 (en) 2014-04-18 2017-09-26 Seeo, Inc. Polymer composition with electrophilic groups for stabilization of lithium sulfur batteries
KR102207927B1 (ko) 2014-07-14 2021-01-26 삼성전자주식회사 전해질, 상기 전해질을 포함하는 리튬전지 및 리튬금속전지, 및 상기 전해질의 제조방법
EP2991153B1 (en) 2014-08-28 2023-08-23 Samsung Electronics Co., Ltd. Composite electrolyte and lithium battery including the same
CN105390744B (zh) * 2014-08-29 2021-10-22 三星电子株式会社 复合物、其制备方法、包括其的电解质及锂二次电池
KR20160026644A (ko) * 2014-08-29 2016-03-09 삼성전자주식회사 복합체, 그 제조방법, 이를 포함하는 전해질 및 리튬이차전지
EP3001494B1 (en) 2014-09-19 2018-08-15 Samsung Electronics Co., Ltd. Electrolyte, method of preparing the electrolyte, and lithium secondary battery comprising the electrolyte
US10361456B2 (en) 2014-09-26 2019-07-23 Samsung Electronics Co., Ltd. Electrolyte, method of preparing the electrolyte, and secondary battery including the electrolyte
WO2016160703A1 (en) 2015-03-27 2016-10-06 Harrup Mason K All-inorganic solvents for electrolytes
EP3076470B1 (en) * 2015-04-03 2019-10-16 Samsung Electronics Co., Ltd. Lithium secondary battery
KR102592691B1 (ko) * 2015-04-03 2023-10-24 삼성전자주식회사 리튬이차전지용 전해질 및 이를 포함하는 리튬이차전지
KR102452944B1 (ko) * 2015-05-12 2022-10-11 삼성전자주식회사 전해질 복합체, 및 이를 포함하는 음극과 리튬 이차 전지
KR20180005173A (ko) * 2015-05-12 2018-01-15 시오 인코퍼레이티드 리튬 배터리를 위한 전해질로서의 peo 및 플루오르화 중합체의 공중합체
KR102466670B1 (ko) * 2015-05-29 2022-11-14 삼성전자주식회사 리튬 전지용 전해질, 및 이를 포함하는 음극 및 리튬 전지
KR20160149103A (ko) 2015-06-17 2016-12-27 삼성전자주식회사 양극, 이를 포함하는 금속-공기 전지 및 양극 제조 방법
WO2017058676A1 (en) 2015-09-30 2017-04-06 Seeo, Inc. Block copolymer electrolytes containing polymeric additives
US10158146B2 (en) 2015-09-30 2018-12-18 Seeo, Inc. Block copolymer electrolytes containing polymeric additives
KR20170062095A (ko) 2015-11-27 2017-06-07 삼성전자주식회사 리튬 공기 전지용 양극, 이를 포함하는 리튬 공기 전지, 및 상기 리튬 공기 전지용 양극의 제조방법
CN105552437B (zh) * 2015-12-16 2018-10-02 中山大学 一种聚醚/聚丙烯酸酯聚合物电解质及其制备方法和应用
US10622672B2 (en) 2015-12-28 2020-04-14 Seeo, Inc Ceramic-polymer composite electrolytes for lithium polymer batteries
KR102446987B1 (ko) 2016-03-05 2022-09-23 시오 인코퍼레이티드 리튬 배터리를 위한 가교된-상호침투 네트워킹된 블록 공중합체 전해질
CN107305950B (zh) 2016-04-19 2019-11-05 宁德新能源科技有限公司 聚合物保护膜、金属锂负极片、锂二次电池
CN107394115B (zh) 2016-04-29 2022-03-29 三星电子株式会社 用于锂金属电池的负极和包括其的锂金属电池
US10741846B2 (en) 2016-05-09 2020-08-11 Samsung Electronics Co., Ltd. Negative electrode for lithium metal battery and lithium metal battery comprising the same
CN109312075B (zh) 2016-06-07 2022-06-14 西奥公司 用于高压锂电池的聚烷氧基硅氧烷阴极电解液
US10707531B1 (en) 2016-09-27 2020-07-07 New Dominion Enterprises Inc. All-inorganic solvents for electrolytes
US10944120B2 (en) 2016-10-25 2021-03-09 Samsung Electronics Co., Ltd. Polymer electrolyte, method of preparing the polymer electrolyte, and lithium metal battery including the same
US10361457B2 (en) 2017-03-24 2019-07-23 Seeo, Inc. Polar polysiloxane electrolytes for lithium batteries
US10367228B2 (en) 2017-04-07 2019-07-30 Seeo, Inc. Diester-based polymer electrolytes for high voltage lithium ion batteries
CN108933286B (zh) * 2017-05-26 2020-11-06 北京师范大学 一种含有环状醚类化合物的可凝胶化体系及其制备方法和应用
WO2018214971A1 (zh) 2017-05-26 2018-11-29 北京师范大学 一种含有醚类化合物的可凝胶化体系及其制备方法和应用
US10581050B2 (en) 2017-06-07 2020-03-03 Robert Bosch Gmbh Battery having a low counter-ion permeability layer
KR102682126B1 (ko) 2017-08-04 2024-07-08 삼성전자주식회사 고체 전해질, 그 제조방법 및 이를 포함한 리튬전지
KR102466675B1 (ko) * 2017-08-25 2022-11-14 삼성전자주식회사 탄소 복합체, 이를 포함하는 전극 및 리튬-공기 전지, 및 탄소 복합체 제조방법
KR102229457B1 (ko) 2017-09-21 2021-03-18 주식회사 엘지화학 고분자 전해질 및 이의 제조방법
KR102131766B1 (ko) * 2018-04-24 2020-07-08 인천대학교 산학협력단 겔형 고분자 전해질 막 및 이의 제조방법
JP7193251B2 (ja) * 2018-04-25 2022-12-20 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング 固体電解質膜の製造方法
CN108598564A (zh) * 2018-04-28 2018-09-28 南开大学 一种固态聚合物电解质及其制备方法和应用
WO2019231892A1 (en) 2018-05-31 2019-12-05 Robert Bosch Gmbh Electrode configuration with a protrusion inhibiting separator
KR102346844B1 (ko) * 2018-07-25 2022-01-03 주식회사 엘지에너지솔루션 고분자 전해질 및 이의 제조방법
CN111039333A (zh) 2018-10-11 2020-04-21 三星电子株式会社 钙钛矿材料、其制备方法以及包括钙钛矿材料的二次电池
US20200259206A1 (en) 2019-02-13 2020-08-13 Seeo, Inc. Reduced llto particles with electronically insulating coatings
US11258102B2 (en) 2019-05-17 2022-02-22 Robert Bosch Gmbh Fluorinated ionic liquids for multi-layer Li ion battery applications
CN112542330B (zh) * 2019-09-23 2022-01-28 天津大学 一种双网络物理交联离子凝胶电解质及其制备方法和应用
KR20210039056A (ko) 2019-10-01 2021-04-09 현대자동차주식회사 이온 전도성 및 기계적 강도가 우수한 고분자 전해질 및 이의 제조방법
KR102712563B1 (ko) 2019-11-18 2024-10-02 삼성디스플레이 주식회사 양자점, 이를 포함하는 조성물 또는 복합체, 패턴화된 막, 및 이를 포함하는 표시 소자
CN114512715A (zh) * 2022-01-20 2022-05-17 贵阳学院 一种聚氧化乙烯基固态电解质及其制备方法和锂离子电池

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3637794A (en) 1967-04-13 1972-01-25 Olin Mathieson Borate esters prepared by successive reactions of boric acid with glycol monoethers and polyols
US4311566A (en) * 1980-07-30 1982-01-19 Ppg Industries, Inc. Electrolyte permeable diaphragm
US4582876A (en) 1984-09-10 1986-04-15 Eastman Kodak Company High-impact polyester/styrene-maleic anhydride copolymer blends
GB8716559D0 (en) 1987-07-14 1987-08-19 Secr Defence Ion conductors
GB9121117D0 (en) 1991-10-03 1991-11-13 Nat Res Dev Ionically conductive polymer gels
JPH05120912A (ja) * 1991-10-30 1993-05-18 Matsushita Electric Ind Co Ltd 高分子固体電解質
US5523180A (en) 1992-06-16 1996-06-04 Centre National De La Recherche Scientifique Ionically conductive material having a block copolymer as the solvent
JP3105137B2 (ja) * 1993-08-18 2000-10-30 信越化学工業株式会社 複合固体電解質
US5658685A (en) * 1995-08-24 1997-08-19 Motorola, Inc. Blended polymer gel electrolytes
JP3407501B2 (ja) 1995-09-29 2003-05-19 松下電器産業株式会社 ポリマ電解質およびそれを用いたリチウム・ポリマ電池
AU4987997A (en) * 1996-10-11 1998-05-11 Massachusetts Institute Of Technology Polymer electrolyte, intercalation compounds and electrodes for batteries
US6395367B1 (en) 1996-12-30 2002-05-28 Hydro-Quebec Pentacyclic anion salts or tetrazapentalene derivatives and their uses as ionic conducting materials
JPH1167274A (ja) * 1997-08-22 1999-03-09 Daikin Ind Ltd リチウム二次電池及び高分子ゲル電解質並びにリチウム二次電池用結着剤
JP4092669B2 (ja) 1998-04-27 2008-05-28 ソニー株式会社 固体電解質二次電池
JP5081345B2 (ja) 2000-06-13 2012-11-28 富士フイルム株式会社 光電変換素子の製造方法
TW527745B (en) 2000-11-21 2003-04-11 Dainichiseika Color Chem Solidifying material for cell electrolyte solution, and cell comprising the solidifying material
JP3993424B2 (ja) * 2000-11-21 2007-10-17 大日精化工業株式会社 電池用電解質溶液の固形化材および電池
JP4038685B2 (ja) * 2003-12-08 2008-01-30 独立行政法人科学技術振興機構 アクチュエータ素子
WO2006116844A1 (en) 2005-05-02 2006-11-09 National Research Council Of Canada Method and apparatus for fine particle liquid suspension feed for thermal spray system and coatings formed therefrom
US8268197B2 (en) 2006-04-04 2012-09-18 Seeo, Inc. Solid electrolyte material manufacturable by polymer processing methods
US8563168B2 (en) 2006-04-04 2013-10-22 The Regents Of The University Of California High elastic modulus polymer electrolytes
WO2008097300A2 (en) * 2007-02-08 2008-08-14 Regents Of The University Of Minnesota Ion gels and electronic devices utilizing ion gels

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JP2011510456A (ja) 2011-03-31
CN101939869B (zh) 2015-09-23
EP2240975A1 (en) 2010-10-20
EP2240975B1 (en) 2016-11-16
EP2240975A4 (en) 2012-02-15
WO2009092058A1 (en) 2009-07-23
US8889301B2 (en) 2014-11-18
US20110206994A1 (en) 2011-08-25
CN101939869A (zh) 2011-01-05

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